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          <h1 class="post-title" itemprop="name headline">CSS选择器及优先级权重</h1>
        

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        <h3 id="CSS-选择器分类"><a href="#CSS-选择器分类" class="headerlink" title="CSS 选择器分类"></a>CSS 选择器分类</h3><ul>
<li><p>标签选择 （div）</p>
</li>
<li><p>id选择器 （#id）</p>
</li>
<li><p>class选择器  (.class)</p>
<a id="more"></a>
</li>
<li><p>后代选择 （div a）</p>
</li>
<li><p>子代选择 （div &gt; p）</p>
</li>
<li><p>相邻选择 （div + p）</p>
</li>
<li><p>通配符选择 （*）</p>
</li>
<li><p>否定选择器 :not(.link){}</p>
</li>
<li><p>属性选择器</p>
</li>
<li><p>伪类选择器</p>
</li>
<li><p>伪元素选择器 ::before{}</p>
</li>
</ul>
<h3 id="CSS3属性选择器"><a href="#CSS3属性选择器" class="headerlink" title="CSS3属性选择器"></a>CSS3属性选择器</h3><table>
<thead>
<tr>
<th>选择器</th>
<th>描述</th>
</tr>
</thead>
<tbody><tr>
<td>[attribute]</td>
<td>用于选取带有指定属性的元素。</td>
</tr>
<tr>
<td>[attribute=value]</td>
<td>用于选取带有指定属性和值的元素。</td>
</tr>
<tr>
<td>[attribute~=value]</td>
<td>用于选取属性值中包含指定词汇的元素。</td>
</tr>
<tr>
<td>[attribute|=value]</td>
<td>用于选取带有以指定值开头的属性值的元素，该值必须是整个单词。</td>
</tr>
<tr>
<td>[attribute^=value]</td>
<td>匹配属性值以指定值开头的每个元素。</td>
</tr>
<tr>
<td>[attribute$=value]</td>
<td>匹配属性值以指定值结尾的每个元素。</td>
</tr>
<tr>
<td>[attribute*=value]</td>
<td>匹配属性值中包含指定值的每个元素。</td>
</tr>
</tbody></table>
<h3 id="CSS3伪类选择器"><a href="#CSS3伪类选择器" class="headerlink" title="CSS3伪类选择器"></a>CSS3伪类选择器</h3><p><a href="https://developer.mozilla.org/zh-CN/docs/Web/CSS/Pseudo-classes#%E6%A0%87%E5%87%86%E4%BC%AA%E7%B1%BB%E7%B4%A2%E5%BC%95" target="_blank" rel="noopener">伪类 | MDN</a><br>常用：</p>
<ul>
<li>:hover</li>
<li>:focus</li>
<li>:after 在元素之前添加内容,也可以用来做清除浮动。</li>
<li>:before 在元素之后添加内容</li>
<li>:enabled 选择器匹配每个已启用的元素（大多用在表单元素上）。</li>
<li>:disabled 控制表单控件的禁用状态。</li>
<li>:checked 单选框或复选框被选中</li>
<li>::selection  用户选中的区域</li>
<li>:empty   一般用来隐藏内部什么都没有的元素</li>
<li>:not(selecter)</li>
<li>​</li>
<li>p:first-of-type </li>
<li>p:last-of-type </li>
<li>p:only-of-type </li>
<li>p:nth-of-type(n)</li>
<li>p:nth-last-of-type(n)</li>
<li>​</li>
<li>:nth-child(n)</li>
<li>:nth-last-child(n)</li>
<li>p:only-child </li>
</ul>
<h3 id="伪类和伪元素区别"><a href="#伪类和伪元素区别" class="headerlink" title="伪类和伪元素区别"></a>伪类和伪元素区别</h3><ul>
<li>伪类值一种状态 比如:hover</li>
<li>伪元素是一个真实存在的元素，他可以有样式有内容</li>
</ul>
<h3 id="iconfont原理"><a href="#iconfont原理" class="headerlink" title="iconfont原理"></a>iconfont原理</h3><ul>
<li>利用编码让图标编为一个字符</li>
<li>引入字体</li>
<li>利用before伪元素向页面中插入一个文字</li>
</ul>
<h3 id="css-定义的权重"><a href="#css-定义的权重" class="headerlink" title="css 定义的权重"></a>css 定义的权重</h3><ul>
<li><p>!important 优先级最高，但也会被权重高的important所覆盖</p>
</li>
<li><p>行内样式总会覆盖外部样式表的任何样式(除了!important)</p>
</li>
<li><p>单独使用一个选择器的时候，不能跨等级使css规则生效</p>
</li>
<li><p>如果两个权重不同的选择器作用在同一元素上，权重值高的css规则生效</p>
</li>
<li><p>如果两个相同权重的选择器作用在同一元素上：以后面出现的选择器为最后规则</p>
</li>
<li><p>权重相同时，与元素距离近的选择器生</p>
<h5 id="权值等级划分，-一般来说是划分4个等级："><a href="#权值等级划分，-一般来说是划分4个等级：" class="headerlink" title="　　权值等级划分， 一般来说是划分4个等级："></a>　　权值等级划分， 一般来说是划分4个等级：</h5></li>
<li><p>第一等级：代表 内联样式，如 style=””，权值为 1,0,0,0；</p>
</li>
<li><p>第二等级：代表 ID选择器，如 #id=””, 权值为 0,1,0,0；</p>
</li>
<li><p>第三等级：代表 calss | 伪类 | 属性 选择器，如 .class | :hover,:link,:target | [type],<br> 权值 0,0,1,0；</p>
</li>
</ul>
<ul>
<li>第四等级：代表 标签 | 伪元素 选择器，如 p | ::after, ::before, ::fist-inline,<br> ::selection, 权值 0,0,0,1；</li>
</ul>
<ul>
<li>此外，通用选择器（*），子选择器（&gt;）， 相邻同胞选择器（+）等选择器不在4等级之内，所以它们的权值都为 0,0,0,0；<h5 id="权值计算-公式："><a href="#权值计算-公式：" class="headerlink" title="权值计算 公式："></a>权值计算 公式：</h5></li>
</ul>
<p><font color="blue" size="4">权值 = 第一等级选择器<em>个数，第二等级选择器</em>个数，第三等级选择器<em>个数，第四等级选择器</em>个数</font><img src="https://imgconvert.csdnimg.cn/aHR0cHM6Ly9pbWFnZXMyMDE4LmNuYmxvZ3MuY29tL2Jsb2cvNzM0NDAyLzIwMTgwMy83MzQ0MDItMjAxODAzMTUxODAyNTI5NTMtODQ5MTMzMzE0LnBuZw" alt="在这里插入图片描述"></p>
<p><strong>一句话总结：</strong></p>
<p><font color="blue" size="4">css属性!important&gt;内联样式 &gt;ID选择器(id)&gt;类选择器(.class) = 伪类选择器(:hover等) = 属性选择器[type等] &gt;元素选择器(p等) = 伪元素选择器(:after/:before/::selection等) &gt;通用选择器(*) &gt;继承的样式</font></p>
<h3 id="浏览器解析CSS"><a href="#浏览器解析CSS" class="headerlink" title="浏览器解析CSS"></a>浏览器解析CSS</h3><p><code>.wrapper div &gt; p</code>  CSS中，浏览器查找元素是通过选择权从后往前找的， 这样做的目的是加快CSS解析速度，从后往前，排除法</p>
<p><a href="https://blog.csdn.net/qq_21397815/article/details/72874932" target="_blank" rel="noopener">浏览器解析css选择器的规则</a></p>

      
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        <div style="text-align:center;color: #ccc;font-size:14px;">-------------本文结束<i class="fa fa-paw"></i>感谢您的阅读-------------</div>
    
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    // handle and trigger popup window;
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